How to Install a Kitchen Sink Air Gap
A kitchen sink air gap is a simple plumbing device that prevents contaminated water (and possibly sewage) from siphoning into your dishwasher in the event of a backup in the kitchen sink. Air gaps are required by many local building codes and are recommended by most dishwasher manufacturers. An air gap installs into one of the precut holes along the rear shelf portion of the sink. If your sink has no available holes, drill a new hole into the shelf, using a drill and the appropriate type of hole saw; contact the sink manufacturer for recommendations. Does this Spark an idea?
Things You'll Need
- Channel-type pliers
- Utility knife
- Screwdriver
- Dishwasher drain hose (as needed)
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Instructions
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Fit the air gap body into the sink hole and secure it to the underside of the sink with the provided retaining nut. Tighten the nut carefully with channel-type pliers.
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Fit the end of the dishwasher drain hose over the smaller nipple on the air gap; if necessary, trim the hose to length with a utility knife. Secure the hose to the nipple with a hose clamp, tightening the clamp with a screwdriver, nut driver or socket wrench.
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Cut a length of hose to run between the larger air gap nipple and the inlet nipple on the garbage disposal. Fit the hose ends over the two nipples and secure them with hose clamps.
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Install the air gap cap over the top end of the air gap body (on the sink top), as directed by the manufacturer.
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References
- “The Complete Guide to Home Plumbing;” Creative Publishing International; 2008
